VR: Don't manipulate incognito tab state for regular tabs.

BUG=824969
R=mthiesse

Change-Id: Ifeb8f82e41ade9bdb10c7649cb7d2a4f1e06851c
Reviewed-on: https://chromium-review.googlesource.com/978659Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545647}

chrome/browser/android/vr/vr_shell.cc

@@ -556,16 +556,20 @@ void VrShell::OnTabUpdated(JNIEnv* env,
                            jboolean incognito,
                            jint id,
                            jstring jtitle) {
-  incognito_tab_ids_.insert(id);
-  ui_->SetIncognitoTabsOpen(!incognito_tab_ids_.empty());
+  if (incognito) {
+    incognito_tab_ids_.insert(id);
+    ui_->SetIncognitoTabsOpen(!incognito_tab_ids_.empty());
+  }
 }
 
 void VrShell::OnTabRemoved(JNIEnv* env,
                            const JavaParamRef<jobject>& obj,
                            jboolean incognito,
                            jint id) {
-  incognito_tab_ids_.erase(id);
-  ui_->SetIncognitoTabsOpen(!incognito_tab_ids_.empty());
+  if (incognito) {
+    incognito_tab_ids_.erase(id);
+    ui_->SetIncognitoTabsOpen(!incognito_tab_ids_.empty());
+  }
 }
 
 void VrShell::SetAlertDialog(JNIEnv* env,